Topic: Flickr gallery not loading with change in XML file

I'm working on a website update using SimpleViewer for a gallery, and the Flickr user and tags I want aren't loading. It keeps loading the default best Flickr shots instead. I have tried my personal Flickr page, as well as the one I intend to use, with no success. I even tried a random username that didn't have spaces like the others do, again no luck. Any help much appreciated. Thank you.